Possible Clues:

• Stomach device short on oxygen, perhaps
• Rig acts disturbingly, affecting stomach
• Rabbit runs in twitching and touching stomach
• Stomachic
• Stomach wind's endless gyp!
• By the sound of it it's a great joke to do with the inside
• Little Mary's empty talk, deceitful device mostly
• Great fun and great joke, by the sound of it, in your tum
• Has one the stomach for such a funny joke, by the sound of it?
• Involving one's stomach in following a strict diet